Fresh cow spine two and a half pounds, onion half, potato a, tomato three.

Practice:

1, cattle bones are generally larger and harder, buy in the market when the merchants are asked to chopped into small pieces, go home and clean, fly water for five minutes, (in the water to add a few slices of ginger to get rid of the tartness).

2, tomatoes, onions, potatoes cut.

3, all the ingredients into the soup pot, a few drops of vinegar (so that the calcium within the bones more easily dissolved into the soup).